September 2019

I gnition systems have adapted to deal with different demands, including environmental concerns. Take Stop/Start as an example. The number of vehicles on UK, equipped with idling stop systems (ISS), commonly referred to as Stop/Start, continues to rise due to both the increased public interest in environmental issues and stricter CO 2 exhaust gas regulations. DENSO Afrermarket Europe’s Application & Development Engineer Kayacan Aya comments: “The ISS stops the engine when the vehicle is stationery, although several conditions must be met for it to do so, which will vary according to the vehicle, before restarting the engine when the foot is pushed down on the accelerator. “As a result, during the time the engine has stopped, both fuel consumption and CO 2 exhaust gas quantities are zero. Functionally, with the help of DENSO’s original equipment pedigree, ISS continue to evolve towards greater fuel consumption rate improvements on, for example, vehicles equipped with expanded idling stop, where the engine stops during deceleration, and high-output regenerative braking. These developments point towards full-scale popularisation of Stop/Start devices.“ Kayacan continues: “In terms of figures, depending on vehicle manufacturer specifications, the ISS can improve fuel efficiency by between 3% and 5%; however, DENSO’s advanced ISS technology can lift that number to more than 7%, depending on the VM’s overall systems approach.” ISS top tips DENSO has some ISS top tips: When faced with an ISS repair, technicians will require a scan tool to isolate the cause and then the repair on the ISS and its components The test monitor function is useful for dividing up the system for troubleshooting The number of times that the starter is operated is much greater in vehicles equipped with ISS; for example, the number of start-ups is tallied in Toyota applications fitted with permanently-engaged starter motors. When the number reaches a certain figure, a warning light will illuminate on the dashboard to advise a starter replacement When parts related to ISS are replaced, it is necessary to register or reset the relevant parts on a scan tool to instruct the engine ECU In most vehicles, when the battery terminals are disconnected or reconnected, the vehicle must be driven for a certain amount of time, usually between 15 and 40 minutes (depending on the vehicle), until the ISS is operational. If the vehicle is not driven, the ISS will be prohibited for the specified amount of time Kayacan adds: “DENSO has been developing ISS technology since the 1980s. That experience, paired with its in-depth knowledge of powertrain and thermal management systems, gives DENSO a unique advantage to provide VMs with a complete systems approach. Further details are available online at www.denso-am.co.uk “ Ignition coils It’s not just the functions that are changing, as the components are too. Take ignition coils. Tim Brotherton, 50 AFTERMARKET SEPTEMBER 2019 IGNITION www.aftermarketonline.net START ME UP The various components around ignition systems continue to evolve, requiring ongoing attention from techs Below: DENSO TS starter